Solar Controller SRK868V6 Installation and Operation Instructions
http://www.keracontrols.com
10
3.5.2 Configuration B: 1
Collector array + 1 Storage tank + 1 Pump ( with
2 Sensors
in the water tank )
Description:
The solar pump (P1) is activated when the switch-ON
temperature difference between the collector array (T1)
and the storage tank (T2) is reached. When the
temperature difference between the collector array (T1)
and the storage tank (T2) drops below the switch-OFF
temperature difference, the solar pump (P1) is turned
OFF.
T1: Temperature sensor in the solar collector
T2: Temperature sensor in the bottom part of the tank (for
solar circulation).
T3: Temperature sensor in the top part of the tank (for
optional heating booster).
P1: Solar circulating pump.
P2: ( Optional ) User hot water circulating pump.
Notes:
H1: Terminals for connecting to the optional tank heating
booster.
T4: Optional temperature sensor of the user hot water
pipe.
T3: If the sensor T3 is damaged or not installed, the
controller will use the signal from the sensor T2 instead,
for the control of the heating booster.
3.6 Differential Temperature control
Functional description:
The Solar panel pump P1 is controlled by the temperature difference. As long as the temperature difference between the
collector and the tank is higher than the preset value, this pump remains ON.
For example: If the switch-ON temperature difference is set to 8
o
C (14F), and the switch-OFF temperature difference is
4
o
C (7F), then for instance:
When the temperature in the bottom part of the tank is +20
o
C (+68F), the collector temperature must rise above +28
o
C
(+82F) to turn ON the pump P1, and the pump will be switched OFF when the temperature falls below +24
o
C (+75F).
Important information
: The controller default switch-ON temperature difference is set to 8
o
C (14F) and the switch-OFF
difference is set to 4
o
C (7F). These are usual standard solar system recommended settings. They should be altered only in
special applications like for instance in very large systems.
Note: To prevent errors, the controller minimum differential (
∆
T
on
-
∆
T
off
) is limited to 2
o
C ( 4F ).
Setup procedure:
►
Press the “
▲
T
” button. The temperature display will flash.
►
Press “
▲
” “
▼
” button to adjust the switch-ON temperature
difference. Adjustable range: 2
o
C to 15
o
C (4F to 27F). The default
value = 8
o
C (14F).
►
Press the “
▲
T
” button again.
►
Press “
▲
” “
▼
” button to adjust the switch-OFF temperature
difference. Adjustment range:
0
o
C (0F) to [
▲
Ton - 2
o
C (4F)]. The default value = 4
o
C (7F).
After 6 seconds, the controller will lock-in the setting.
